Alert archive / Idaho / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 15, NWS Pocatello, ID
NWS Pocatello, ID issued this severe thunderstorm warning at Aug 21, 2021, 3:05 PM MDT for 4 counties in Idaho. It was in force for 29 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 21, 2021, 3:05 PM MDT (21:05 UTC)
- Expired
- Aug 21, 2021, 3:34 PM MDT
- In force
- 29 min
- Issued by
- NWS Pocatello, ID
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bannock County, ID, Bear Lake County, ID, Caribou County, ID, Franklin County, ID
The radar
The Pocatello radar (KSFX), 117 km from the middle of the area, began a volume at 21:09 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 3:10 PM MDT | TSTM WND GST 46 | 6 Nw Mink Creek, ID | MEASURED AT TREASURETON SUMMIT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 9.1 hours before the alert went out and 176 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 77 J/kg
- Mixed-layer CIN
- -271 J/kg
- Mixed-layer LCL
- 2167 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 239 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
805
WUUS55 KPIH 212105
SVRPIH
IDC005-007-029-041-212145-
/O.NEW.KPIH.SV.W.0015.210821T2105Z-210821T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
305 PM MDT Sat Aug 21 2021
The National Weather Service in Pocatello has issued a
* Severe Thunderstorm Warning for...
South central Caribou County in southeastern Idaho...
Southeastern Bannock County in southeastern Idaho...
Northeastern Franklin County in southeastern Idaho...
Northwestern Bear Lake County in southeastern Idaho...
* Until 345 PM MDT.
* At 304 PM MDT, a severe thunderstorm was located over Oneida
Narrows Reservoir, or 13 miles east of Swanlake, moving northeast
at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Georgetown, Thatcher, Oneida Narrows Reservoir and Emmigrant
Summit.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4219 11178 4230 11190 4263 11157 4247 11134
TIME...MOT...LOC 2104Z 228DEG 36KT 4229 11174
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McKaughan2 follow-up statements
015
WWUS55 KPIH 212121
SVSPIH
Severe Weather Statement
National Weather Service Pocatello ID
321 PM MDT Sat Aug 21 2021
IDC005-212130-
/O.CAN.KPIH.SV.W.0015.000000T0000Z-210821T2145Z/
Bannock ID-
321 PM MDT Sat Aug 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BANNOCK COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4227 11166 4237 11173 4258 11152 4247 11134
TIME...MOT...LOC 2120Z 233DEG 32KT 4239 11158
$$
IDC007-029-041-212145-
/O.CON.KPIH.SV.W.0015.000000T0000Z-210821T2145Z/
Caribou ID-Franklin ID-Bear Lake ID-
321 PM MDT Sat Aug 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR SOUTH CENTRAL CARIBOU...NORTHEASTERN FRANKLIN AND NORTHWESTERN
BEAR LAKE COUNTIES...
At 320 PM MDT, a severe thunderstorm was located 7 miles east of
Thatcher, or 14 miles west of Montpelier, moving northeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Georgetown and Emmigrant Summit.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4227 11166 4237 11173 4258 11152 4247 11134
TIME...MOT...LOC 2120Z 233DEG 32KT 4239 11158
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
McKaughan712
WWUS55 KPIH 212134
SVSPIH
Severe Weather Statement
National Weather Service Pocatello ID
334 PM MDT Sat Aug 21 2021
IDC007-029-041-212140-
/O.CAN.KPIH.SV.W.0015.000000T0000Z-210821T2145Z/
Caribou ID-Franklin ID-Bear Lake ID-
334 PM MDT Sat Aug 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CARIBOU...
NORTHEASTERN FRANKLIN AND NORTHWESTERN BEAR LAKE COUNTIES IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.
LAT...LON 4227 11166 4237 11173 4258 11152 4247 11134
TIME...MOT...LOC 2128Z 228DEG 36KT 4246 11147
$$
McKaughanThe office that day
Everything else NWS Pocatello, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 12:46 PM MDT | Special Weather Statement | PIH | Bear Lake | 89 min |
| Aug 21, 2:30 PM MDT | Special Weather Statement | PIH | Franklin | 45 min |
| Aug 21, 3:10 PM MDT | Special Weather Statement | PIH | Custer | 95 min |
| Aug 21, 3:28 PM MDT | Special Weather Statement | PIH | Oneida | 32 min |
| Aug 21, 4:11 PM MDT | Special Weather Statement | PIH | Franklin | 34 min |
| Aug 21, 4:23 PM MDT | Special Weather Statement | PIH | Custer | 97 min |
| Aug 21, 4:51 PM MDT | Special Weather Statement | PIH | Custer | 24 min |
| Aug 21, 4:52 PM MDT | Special Weather Statement | PIH | Caribou | 38 min |
Nearby
Severe Thunderstorm Warnings in Idaho, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.